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-rw-r--r--libc/sysdeps/linux/arm/bits/setjmp.h12
-rw-r--r--libc/sysdeps/linux/arm/bits/syscalls.h70
-rw-r--r--libc/sysdeps/linux/arm/bits/uClibc_arch_features.h41
3 files changed, 115 insertions, 8 deletions
diff --git a/libc/sysdeps/linux/arm/bits/setjmp.h b/libc/sysdeps/linux/arm/bits/setjmp.h
index ad42f96cd..745cdb8f7 100644
--- a/libc/sysdeps/linux/arm/bits/setjmp.h
+++ b/libc/sysdeps/linux/arm/bits/setjmp.h
@@ -27,14 +27,22 @@
#ifndef _ASM
/* Jump buffer contains v1-v6, sl, fp, sp and pc. Other registers are not
saved. */
-#ifdef __MAVERICK__
+#ifdef __ARM_EABI__
+/* The exact set of registers saved may depend on the particular core
+ in use, as some coprocessor registers may need to be saved. The C
+ Library ABI requires that the buffer be 8-byte aligned, and
+ recommends that the buffer contain 64 words. The first 28 words
+ are occupied by v1-v6, sl, fp, sp, pc, d8-d15, and fpscr. (Note
+ that d8-15 require 17 words, due to the use of fstmx.) */
+typedef int __jmp_buf[64] __attribute__((aligned (8)));
+#elif defined __MAVERICK__
typedef int __jmp_buf[34];
#else
typedef int __jmp_buf[22];
#endif
#endif
-#define __JMP_BUF_SP 20
+#define __JMP_BUF_SP 8
/* Test if longjmp to JMPBUF would unwind the frame
containing a local variable at ADDRESS. */
diff --git a/libc/sysdeps/linux/arm/bits/syscalls.h b/libc/sysdeps/linux/arm/bits/syscalls.h
index 21e5b8146..d25d1824e 100644
--- a/libc/sysdeps/linux/arm/bits/syscalls.h
+++ b/libc/sysdeps/linux/arm/bits/syscalls.h
@@ -21,7 +21,22 @@
glibc-2.3.2/sysdeps/unix/sysv/linux/arm/sysdep.h
*/
-#ifndef __ASSEMBLER__
+#ifdef __ASSEMBLER__
+/* Call a given syscall, with arguments loaded. For EABI, we must
+ save and restore r7 for the syscall number. Unlike the DO_CALL
+ macro in glibc, this macro does not load syscall arguments. */
+#undef DO_CALL
+#if defined(__ARM_EABI__)
+#define DO_CALL(syscall_name) \
+ mov ip, r7; \
+ ldr r7, =SYS_ify (syscall_name); \
+ swi 0x0; \
+ mov r7, ip;
+#else
+#define DO_CALL(syscall_name) \
+ swi SYS_ify (syscall_name);
+#endif
+#else
#undef _syscall0
#define _syscall0(type,name) \
@@ -85,18 +100,33 @@ return (type) (INLINE_SYSCALL(name, 7, arg1, arg2, arg3, arg4, arg5, arg6, arg7)
#undef INLINE_SYSCALL
#define INLINE_SYSCALL(name, nr, args...) \
- ({ unsigned int _sys_result = INTERNAL_SYSCALL (name, , nr, args); \
- if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (_sys_result, ), 0)) \
+ ({ unsigned int __sys_result = INTERNAL_SYSCALL (name, , nr, args); \
+ if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (__sys_result, ), 0)) \
{ \
- __set_errno (INTERNAL_SYSCALL_ERRNO (_sys_result, )); \
- _sys_result = (unsigned int) -1; \
+ __set_errno (INTERNAL_SYSCALL_ERRNO (__sys_result, )); \
+ __sys_result = (unsigned int) -1; \
} \
- (int) _sys_result; })
+ (int) __sys_result; })
#undef INTERNAL_SYSCALL_DECL
#define INTERNAL_SYSCALL_DECL(err) do { } while (0)
#undef INTERNAL_SYSCALL
+#if defined(__ARM_EABI__)
+#define INTERNAL_SYSCALL(name, err, nr, args...) \
+ ({unsigned int _sys_result; \
+ { \
+ register int _a1 asm ("r0"), _nr asm ("r7"); \
+ LOAD_ARGS_##nr (args) \
+ _nr = SYS_ify(name); \
+ asm volatile ("swi 0x0 @ syscall " #name \
+ : "=r" (_a1) \
+ : "r" (_nr) ASM_ARGS_##nr \
+ : "memory"); \
+ _sys_result = _a1; \
+ } \
+ (int) _sys_result; })
+#else /* !defined(__ARM_EABI__) */
#if !defined(__thumb__)
#define INTERNAL_SYSCALL(name, err, nr, args...) \
({ unsigned int _sys_result; \
@@ -111,6 +141,11 @@ return (type) (INLINE_SYSCALL(name, 7, arg1, arg2, arg3, arg4, arg5, arg6, arg7)
} \
(int) _sys_result; })
#else
+#if 0
+/* This doesn't work because GCC uses r7 as a frame pointer in
+ * some cases and doesn't notice that the _r7 value changes
+ * it, resulting in mysterious crashes after the SWI.
+ */
#define INTERNAL_SYSCALL(name, err, nr, args...) \
({ unsigned int _sys_result; \
{ \
@@ -124,7 +159,30 @@ return (type) (INLINE_SYSCALL(name, 7, arg1, arg2, arg3, arg4, arg5, arg6, arg7)
_sys_result = _a1; \
} \
(int) _sys_result; })
+#else
+/* So hide the use of r7 from the compiler, this would be a lot
+ * easier but for the fact that the syscalls can exceed 255.
+ * For the moment the LOAD_ARG_7 is sacrificed.
+ */
+#define INTERNAL_SYSCALL(name, err, nr, args...) \
+ ({ unsigned int _sys_result; \
+ { \
+ register int _a1 asm ("a1"); \
+ LOAD_ARGS_##nr (args) \
+ register int _v3 asm ("v3") = (int) (SYS_ify(name)); \
+ asm volatile ("push {r7}\n" \
+ "\tmov r7, v3\n" \
+ "\tswi 0 @ syscall " #name "\n" \
+ "\tpop {r7}" \
+ : "=r" (_a1) \
+ : "r" (_v3) ASM_ARGS_##nr \
+ : "memory"); \
+ _sys_result = _a1; \
+ } \
+ (int) _sys_result; })
+#endif
#endif
+#endif /* !defined(__ARM_EABI__) */
#undef INTERNAL_SYSCALL_ERROR_P
#define INTERNAL_SYSCALL_ERROR_P(val, err) \
diff --git a/libc/sysdeps/linux/arm/bits/uClibc_arch_features.h b/libc/sysdeps/linux/arm/bits/uClibc_arch_features.h
new file mode 100644
index 000000000..93b523f0d
--- /dev/null
+++ b/libc/sysdeps/linux/arm/bits/uClibc_arch_features.h
@@ -0,0 +1,41 @@
+/*
+ * Track misc arch-specific features that aren't config options
+ */
+
+#ifndef _BITS_UCLIBC_ARCH_FEATURES_H
+#define _BITS_UCLIBC_ARCH_FEATURES_H
+
+/* instruction used when calling abort() to kill yourself */
+#define __UCLIBC_ABORT_INSTRUCTION__ "bl abort"
+
+/* can your target use syscall6() for mmap ? */
+#undef __UCLIBC_MMAP_HAS_6_ARGS__
+
+/* does your target use syscall4() for truncate64 ? (32bit arches only) */
+#undef __UCLIBC_TRUNCATE64_HAS_4_ARGS__
+
+/* does your target have a broken create_module() ? */
+#define __UCLIBC_BROKEN_CREATE_MODULE__
+
+/* does your target prefix all symbols with an _ ? */
+#define __UCLIBC_NO_UNDERSCORES__
+
+/* does your target have an asm .set ? */
+#define __UCLIBC_HAVE_ASM_SET_DIRECTIVE__
+
+/* define if target doesn't like .global */
+#undef __UCLIBC_ASM_GLOBAL_DIRECTIVE__
+
+/* define if target supports .weak */
+#define __UCLIBC_HAVE_ASM_WEAK_DIRECTIVE__
+
+/* define if target supports .weakext */
+#undef __UCLIBC_HAVE_ASM_WEAKEXT_DIRECTIVE__
+
+/* needed probably only for ppc64 */
+#undef __UCLIBC_HAVE_ASM_GLOBAL_DOT_NAME__
+
+/* define if target supports IEEE signed zero floats */
+#define __UCLIBC_HAVE_SIGNED_ZERO__
+
+#endif /* _BITS_UCLIBC_ARCH_FEATURES_H */
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